An iron spearhead, measuring several dozens centimeters in length and most likely of Viking origin was found by Polish archeologists during underwater research in Lubanowo lake, northwest Poland.

Underwater archaeologists from the Institute of Archeology of the University of Warsaw have been conducting research in the lake since 2015.

"We have discovered many unique objects, including this very unusual, large, two-part spear tip," Bartosz Kontny, the head of the research team, told the Polish Press Agency (PAP).

The object has been determined to originate from the early Middle Ages (10-12th century), which is evidenced by the technology of manufacture and the distinctive, wide sleeve in which the shaft was embedded.

“The way the discovered spearhead was made resembles that used at the time by the Vikings to make arrowheads,” Mr Kontny said.

Similar arrowheads with a double blade were discovered in Hedeby, a settlement in northern Germany on the border with Denmark, which was the largest north European city in Viking times, he added.